Access the FASB's Codification Research System at the FASB website (www.fasb.org). Determine the specific citation for each of the following items:
1. Depreciation involves a systematic and rational allocation of cost rather than a process of valuation.
2. The calculation of an impairment loss for property, plant, and equipment.
3. Accounting for a change in depreciation method.
4. Goodwill should not be amortized.